Build 65:
This is an ongoing update, a tool I would be using to create my own RPG games with.
You can load your own tilesets, and start 'drawing' or 'creating' or own map area.
The tiles are fixed at 16x6 size.

Features:
Start drawing with different sized brushes, Small, medium and large.
Flood Fill to replace all tiles of one set with another, or Seed fill to fill an area that is connected or contiguous.
Draw vertical or horizontal lines
Multi-Select (drag select) tileset tiles.